If you flash the ROM with a 1MB BIOS image, you'd be able to load each individual 256K bank and each bank would reflect the above hash. However, if you load the entire 1MB (depending on your chip type and switch settings, if applicable), it will essentially load the same BIOS (though of a different size) but will not reflect the 256K hash.
Either write the whole flash ROM or use Xecuter2 BIOS Manager to split the 1MB BIOS into it's 256K parts.
